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 <11785166+hzyai77@user.noreply.gitee.com>
Date: Thu, 9 Mar 2023 00:04:11 +0000
Subject: [PATCH] =?UTF-8?q?=E7=BB=83=E4=B9=A0=E4=BD=9C=E4=B8=9A?=
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Signed-off-by: 韩震洋 <11785166+hzyai77@user.noreply.gitee.com>
---
 .../20230308 \347\273\203\344\271\2402.md"    | 71 +++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 "40 \351\237\251\351\234\207\346\264\213/20230308 \347\273\203\344\271\2402.md"

diff --git "a/40 \351\237\251\351\234\207\346\264\213/20230308 \347\273\203\344\271\2402.md" "b/40 \351\237\251\351\234\207\346\264\213/20230308 \347\273\203\344\271\2402.md"
new file mode 100644
index 0000000..c3be06f
--- /dev/null
+++ "b/40 \351\237\251\351\234\207\346\264\213/20230308 \347\273\203\344\271\2402.md"	
@@ -0,0 +1,71 @@
+```mysql
+create database student charset utf8;
+use student;
+create table tool (
+orderid int PRIMARY KEY,
+orderdate date);
+insert into tool values (1,'2008-01-12 00:00:00.000'),(2,'2008-02-10 00:00:00.000'),
+(3,'2008-02-15 00:00:00.000'),(4,'2008-03-10 00:00:00.000');
+create table tooll (
+itemid int,
+orderid int ,
+itemtype varchar(255),
+itemname varchar(25),
+thenumber int,
+themoney int,
+FOREIGN key (orderid) REFERENCES tool(orderid)
+);
+insert into tooll values (1,1,'文具','笔',72,2),
+(2,1,'文具','尺',10,1),
+(3,1,'体育用品','篮球',1,56),
+(4,2,'文具','笔',36,2),
+(5,2,'文具','固体胶',20,3),
+(6,2,'日常用品','透明胶',2,1),
+(7,2,'体育用品','羽毛球',20,3),
+(8,3,'文具','订书机',20,3),
+(9,3,'文具','订书针',10,3),
+(10,3,'文具','裁纸刀',5,5),
+(11,4,'文具','笔',20,2),
+(12,4,'文具','信纸',50,1),
+(13,4,'日常用品','毛巾',4,5),
+(14,4,'日常用品','透明胶',30,1),
+(15,4,'体育用品','羽毛球',20,3);
+-- 根据图示，完成下列题目：
+-- 
+-- 1.查询所有的订单的订单的编号，订单日期，产品名称，订购数量和订购单价
+select * from tool left join tooll on tool.orderid = tooll.orderid;
+-- 2.查询订购数量大于50的订单的编号，订单日期，订购产品的类别和订购的产品名称
+select * from tool left join tooll on tool.orderid = tooll.orderid where thenumber>50;
+
+-- 3.查询所有的订单的订单的编号，订单日期，订购产品的类别和订购的产品名称，订购数量和订购单价以及订购总价
+ select distinct itemid,tooll.orderid,itemtype,itemname,thenumber,themoney,(thenumber*themoney) 订购总价 from tool left join tooll on tool.orderid = tool.orderid;
+ 
+-- 4.查询单价大于等于5 或者 数量大于等于50的订单的订单的编号，订单日期，订购产品的类别和订购的产品名称，订购数量和订购单价以及订购总价
+select itemid,tooll.orderid,itemtype,itemname,thenumber,themoney,(thenumber*themoney) 订购总价 from tool left join tooll on tool.orderid = tooll.orderid where themoney>=5 or thenumber >=50;
+
+-- 5.查询每个订单分别订购了几个产品，例如：
+-- 			编号   订购产品数
+     -- 1 3
+--                                             	  2           4
+select itemid,thenumber from tooll where orderid = 1
+union
+select itemid,thenumber from tooll where orderid = 2;
+-- 6.查询每个订单里的每个类别的产品分别订购了几次和总数量，例如：
+select orderid,itemtype,thenumber,sum(orderid) from tooll where orderid = 1 group by itemtype
+union
+select orderid,itemtype,thenumber,sum(orderid) from tooll where orderid = 2 group by itemtype
+union
+select orderid,itemtype,thenumber,sum(orderid) from tooll where orderid = 3 group by itemtype
+union
+select orderid,itemtype,thenumber,sum(orderid) from tooll where orderid = 4 group by itemtype;
+
+--  订单编号       产品类别     订购次数     总数量
+-- 
+--     1           文具            	2           82
+--     1           体育用品        	1            1
+--     2           文具            	2           56
+--     2           体育用品        	1            2
+--     2           日常用品        	1            20
+-- 
+```
+
-- 
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